Linkwheelie - Extract unlimited leads and 100% valid & verified emails from LinkedIn without giving access to your LinkedIn profile.
Phantombuster - A marketplace of simple to use no-code APIs
Evaboot - LinkedIn sales navigator without the bad results
Wiza - Create email lists from Linkedin Sales Navigator
Optingun - Optingun helps online businesses to create forms to convert website visitors into subscribers using action driven popups and social optins.
Hunter - Find all the email addresses related to a domain